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<div class="moz-cite-prefix">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:<br>
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<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Hello
All!<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><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:<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:10.0pt;font-family:Symbol;color:black"><span
style="mso-list:Ignore">·<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><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?<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:10.0pt;font-family:Symbol;color:black"><span
style="mso-list:Ignore">·<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><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?)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Thank
you for your time,
<o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">______________________________________________________________________________________________</span></b><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Heidi
Gartner
</span></b><span
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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
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Roman","serif";color:black"> <br>
</span><span
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width="155"></span><span
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 style="font-size:7.5pt;font-family:"Times
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</span><span
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250 387-2932
</span><span
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