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<p class="MsoNormal">Hi Tonya<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I concur with Dirk – there is a greater risk of damage to the slides from freezing than from pests.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Cathy<o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Catharine Hawks
</span></b><i><span style="font-size:9.0pt;font-family:"Arial",sans-serif">(she, her, hers)</span></i><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Conservator</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Collections Program</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif">MRC 170 Rm M85-J</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif">National Museum of Natural History</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif">10th Street & Constitution Ave NW</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Washington DC 20560</span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif">w</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif"> 202.633.0835 or 4041
<b>c</b> 703 200 4370</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif"><a href="mailto:hawksc@si.edu"><span style="color:#0563C1">hawksc@si.edu</span></a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#00C1D5">SMITHSONIAN INSTITUTION</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#00778B">NATIONAL MUSEUM OF NATURAL HISTORY</span><o:p></o:p></p>
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<p class="MsoNormal"><i><span style="font-size:9.0pt"> </span></i><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu> <b>
On Behalf Of </b>Dirk Neumann<br>
<b>Sent:</b> Thursday, April 15, 2021 1:54 AM<br>
<b>To:</b> nhcoll-l@mailman.yale.edu<br>
<b>Subject:</b> Re: [Nhcoll-l] Freezing as preventative pest treatmenet<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<b><span style="font-size:9.0pt;color:#9C6500">External Email - Exercise Caution</span></b><o:p></o:p></p>
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<p class="MsoNormal">Hi Tonya,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">my personal thoughts are that this depends a bit on potentially different expansion coefficients of the slides embedding agents and cover slips and potentially unwanted condensation effects when moving the slides out of the freezers again.
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Birger Neuhaus at the MfN in Berlin published a really comprehensive piece on the conservation of microslides which is available
<a href="https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.biotaxa.org%2FZootaxa%2Farticle%2Fview%2Fzootaxa.4322.1.1&data=04%7C01%7Chawksc%40si.edu%7C188774c624a545ec28bf08d8ffd2d90f%7C989b5e2a14e44efe93b78cdd5fc5d11c%7C0%7C0%7C637540628357383441%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=RkE6Q7oRNazKEg69IkFCeqZSQEbJ1yuzzsOJb4JkIpg%3D&reserved=0">
here</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">He basically says the same cautioning that mounting media might suffer from shrinkage and also the glass itself (depending on the quality especially in historic objects) might be damaged from this harsh temperature shock.<o:p></o:p></p>
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<p class="MsoNormal">Hope this helps<o:p></o:p></p>
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<p class="MsoNormal">Dirk<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">****<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">"<i>Recently, the Museum für Naturkunde Berlin established in the frame of a pest management program a quarantine and freezing station for incoming parcels with special attention to entomological items returned from the borrower. Material
from wet collections and microscope slides are excluded from this practice, because both mounting media (Brown 1997, p. 6) and coverslip seals containing polymers (Shashoua 2008, p. 203) would suffer from shrinkage or formation of large hexagonal ice crystals,
which pierce cell membranes and the like during the freezing process (Florian 1990; Allington & Sherlock 2007a, 2007b). The latter authors demonstrated that damage occurred already after freezing coverslip seals just a few times. The consequences of these
processes have already been recognized at the Natural History Museum in London (Brown 1997).</i>"<o:p></o:p></p>
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<p class="MsoNormal">Am 15.04.2021 um 00:59 schrieb Haff, Tonya (NCMI, Crace):<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Hello all,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">I am wondering if any of you have insight into freezing everything in a collection before moving in to a new building. Specifically, I am wondering about things like slides. Are histology, etc
slides safe to be frozen at -30 to -40C? Is there anything else that I should be thinking about? <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Thanks!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Tonya<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Dr Tonya Haff<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Collection Manager<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Australian National Wildlife Collection<o:p></o:p></span></p>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
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</blockquote>
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