<div dir="ltr"><div>Dear all,</div><div><br></div><div>We're working on new collection protocols, trying to write everything down and see if all is up to date. One of the topics is the decontamination by freezing of herbarium specimens.</div><div><br></div><div>We are familiar with the herbarium handbook, but do any of you know about recent research on this matter? We decontaminate our herbarium specimens for 72 hours at -30 Celsius. I'm finding varying policies on decontaminating herbarium specimens. From at least 48 hours at -18 to 14 days at -40. Is there a bare minimum of hours that specimens need to be frozen and is freezing at colder temperatures more damaging to the specimens?<br></div><div><br></div>Thanks for you help,<div><br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><div><br></div><div>Roxali Bijmoer<br></div><div>Collections Manager Herbarium<br></div><div><br></div><div><img src="http://logo.naturalis.nl/logo.png" alt="" border="0"><br></div><div><span style="font-size:xx-small">T 071-7519234 Website:</span><span style="font-size:xx-small"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__science.naturalis.nl_en_people_collection-2Dmanagers_roxali-2Dbijmoer_&d=DwMFaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=Pty8C-kkPWR_4Q9AwOkx4aMA5CJTIG-VUT9KPRNQtbs&s=yreMXx0HwV-80cGjAzWdylyIKncgmWlN0OwacSQM6EU&e=" target="_blank">https://science.naturalis.nl/en/people/collection-managers/roxali-bijmoer/</a></span><br><span style="font-size:xx-small">Nieuwenhuizenweg 19, Postbus 9517, 2300 RA Leiden<br></span><span style="font-size:xx-small">E </span><a href="mailto:roxali.bijmoer@naturalis.nl" style="font-size:xx-small" target="_blank">roxali.bijmoer@naturalis.nl</a><span style="font-size:xx-small">, </span><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.naturalis.nl_&d=DwMFaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=Pty8C-kkPWR_4Q9AwOkx4aMA5CJTIG-VUT9KPRNQtbs&s=VjJ88Ke8_zGpvxZE54cpdFXgO8UMDpAG_qWG2bRSDl4&e=" rel="nofollow" style="font-size:xx-small" target="_blank">I www.naturalis.nl</a> </div><div><span style="font-size:xx-small">Website:</span><span style="font-size:xx-small"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__science.naturalis.nl_en_people_collection-2Dmanagers_roxali-2Dbijmoer_&d=DwMFaQ&c=cjytLXgP8ixuoHflwc-poQ&r=LpYc_Z_iN1KRw0hheb3x6-8MJUMu482qfHowpGYJqwc&m=Pty8C-kkPWR_4Q9AwOkx4aMA5CJTIG-VUT9KPRNQtbs&s=yreMXx0HwV-80cGjAzWdylyIKncgmWlN0OwacSQM6EU&e=" target="_blank">https://science.naturalis.nl/en/people/collection-managers/roxali-bijmoer/</a></span><br></div><div><br></div><div><br></div><div><br></div><div><p dir="ltr" style="font-size:x-small;line-height:1.38;margin-top:0pt;margin-bottom:0pt"><br></p></div><div><br><span style="font-family:courier new,monospace"><br></span></div></div><span style="font-family:courier new,monospace"> </span><div><span style="font-family:courier new,monospace"> <br></span></div></div></div></div></div></div></div></div></div></div></div>
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