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<div class="moz-cite-prefix">Hi Yves,<br>
<br>
Dixon glass sells similar jars, but they are also very tight
closing.<br>
<br>
Your colleagues in Tervuren have a brilliant and very simple tool
to open this type of ground stoppers by using simple flattened
wooden strips and lifting the lids from the rim of the specimen
jar. Works perfectly fine (but only with stoppers that have a
notch at the base of the handle serving as counter bearing for the
wooden levers; use stable oak or beech wood for the wooden
levers).<br>
<br>
Alternatively, you could use a non-silicon vacuum grease (e.g.
Alsirol - distributed in some countries by VWR international) to
prevent the stopper to get caught in the neck of the specimen jar.<br>
<br>
Third option: try to close the specimens jar after initial filling
inside your (cooler and nice) storage rooms rather then downstairs
in the lab. This avoids underpressure when the fluid cools down in
the storage room.<br>
<br>
All the best<br>
Dirk <br>
<br>
<br>
Am 28.10.2015 um 13:50 schrieb Yves Samyn:<br>
</div>
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<title>RE: [Nhcoll-l] borosilicate glass</title>
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<p>Hello dirk,</p>
<p> </p>
<p>Thanks for sharing your knowledge, much appreciated!</p>
<p> </p>
<p>But, do you know of other compagnies that sell borosilcate
museum ground glass jars? The type that is in your mail seals
tightly, very tightly, we always have difficulty in opening them
when a specimen needs to be examined.</p>
<p> </p>
<p>Thanks again and cheers,</p>
<p>Yves<br>
</p>
<blockquote style="border-left: 2px solid #325FBA; padding-left:
5px;margin-left:5px;">-----Original message-----<br>
<strong>From:</strong> Dirk Neumann
<a class="moz-txt-link-rfc2396E" href="mailto:dirk.neumann@zsm.mwn.de"><dirk.neumann@zsm.mwn.de></a><br>
<strong>Sent:</strong> Wed 28-10-2015 13:16<br>
<strong>Subject:</strong> Re: [Nhcoll-l] borosilicate glass<br>
<strong>To:</strong> <a class="moz-txt-link-abbreviated" href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a>; <br>
<style type="text/css">body { font-family: monospace; }</style>
<div style="background-color: #FFFFFF; color: #000000; ">
<div>Hello Heidi,<br>
<br>
stoelzle oberglass has a branch in North America if I am not
completely wrong. They produce high quality ground stopper
jars, but available sizes are limited and designed to hold
larger specimens instead of small.<br>
<br>
There are different qualities of soda-lime glass; for
example, most glass containers used in chemical laboratories
are soda-lime and inert, because of a special coating of the
glass surface. This glass quality is called "neutral glass"
sometimes (e.g. used for pharmaceutical jars which are also
available as clear glass).<br>
<br>
Uncoated soda-lime glass has the problem that dissolving
ions create a highly reactive (basic) surface which could
harm specimens. But this is rather an issue of specimen size
in relation to contact surface, e.g. dozens of small insects
sitting in a small soda-lime tube have a large contact
surface, while a big trout in a large soda-lime jar has a
comparatively small contact surface.<br>
<br>
In terms of long term stability, ground-stopper borosilicate
jars are surely more durable than borosilicate twist-off
jars; the lid of the latter will likely fail before the
glass starts to corrode. <br>
<br>
Regarding DNA-storage in small glass tube, I have no
personal experience, but would definitely choose a certified
high quality tube. Problem here again is the lid; I have
tested some PE-tubes with different lids (inner thread
/outer thread, silicon caulking or not, etc.) and many
failed. As far as I know, there are no studies on the
effects of softeners (plastic tubes) or ions (glass tubes)
leaching and (negatively) affecting DNA quality.<br>
<br>
Hope this helps,<br>
Dirk <br>
<br>
<br>
<br>
Am 27.10.2015 um 22:52 schrieb Gartner, Heidi RBCM:EX:</div>
<blockquote type="cite"
cite="mid:f9291a766f51492c832f4376367d4263@E3PMBX03.idir.BCGOV">
<div>
<p><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Hello
All!</span></p>
<p> </p>
<p><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">I
am looking to source some storage jars for our fluid
preserved invertebrate collection at the RBCM. I
understand that borosilicate glass is optimal for use
in museum work as it can withstand greater physical,
chemical, and temperature stress. However, I am
having difficulties sourcing borosilicate jars in the
sizes I need. It seems most jars sold are either
flint or soda-lime glass. So I am hoping the group
can help answer the following questions:</span></p>
<p style="text-indent:-.25in;"><span
style="font-size:10.0pt;font-family:Symbol;color:black">·<span
style="font:7.0pt "Times New Roman"">
</span></span><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Do
you have a good supplier in North America for a wide
range of borosilicate jar sizes?</span></p>
<p style="text-indent:-.25in;"><span
style="font-size:10.0pt;font-family:Symbol;color:black">·<span
style="font:7.0pt "Times New Roman"">
</span></span><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">What
are the long term effects of using flint or soda-lime
glass? (e.g. Greater risk to general handling? Any
chemical reactions that may affect DNA work?)</span></p>
<p> </p>
<p><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Thank
you for your time, </span></p>
<p><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">______________________________________________________________________________________________</span></b></p>
<p style="margin-bottom:12.0pt"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Heidi
Gartner </span></b><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"> </span><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Collection
Manager, Invertebrates | Collections, Knowledge and
Engagement</span><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"> <br>
</span><span
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style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"><br>
</span><span
style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">675
Belleville Street, Victoria, BC Canada V8W 9W2 </span><span
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</span><span
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<pre cols="72">-- 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-Labor Münchhausenstr. 21 81247 München Besuchen Sie unsere Sammlung: <a moz-do-not-send="true" title="This external link will open in a new window" target="_blank" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.zsm.mwn.de_ich_&d=AwMD-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=CLFZJ3fvGSmDp7xK1dNZfh6uGV_h-8NVlo3fXNoRNzI&m=9QyhrUTN27VdMhZNxtovnw9BB_sOcoXLRMOQUeLRGnA&s=pTGYrP4fdKlvE2sz3rYEl_nPYMKjM0UG3xaWaP1_oW8&e=">http://www.zsm.mwn.de/ich/</a> --------- 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-Lab Muenchhausenstr.
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<pre class="moz-signature" cols="72">--
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-Labor
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-Lab
Muenchhausenstr. 21
81247 Munich (Germany)
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