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<div class=""><span class="" style="font-size: 10.5pt;">Dear all,</span></div>
<p class="MsoNormal"><span class="" style="font-size: 10.5pt;">we have found black-spot-contaminations on several Quantifoil® R 1.2/1.3 + 2 nm carbon grids. The gris originate from four different grid boxes containing each 100 grids per box (</span>approximate<span class="" style="font-size: 10.5pt;"> value
~3000 CHF; most severe case see attachment). </span></p>
<p class="MsoNormal"><span class="" style="font-size: 10.5pt;">Within the past year we tried several times to reach to Quantifoil and asked for guidance. Unfortunately, Quantifoil never provided us with an answer.</span><span class="" style="font-size: 10.5pt;"> </span></p>
<p class="MsoNormal"><span lang="EN-US" class="" style="font-size: 10.5pt;">Does anybody know how to somehow “clean" these 2 nm carbon layer containing grids ? </span></p>
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<div class="">Thanks for your input,<br class="">
Jean-Marc</div>
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<div class="">____________________________<br class="">
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<div>Jean-Marc Jeckelmann, PhD<br class="">
Institute of Biochemistry and Molecular Medicine<br class="">
University of Bern<br class="">
Bühlstrasse 28<br class="">
CH-3012 Bern<br class="">
+41 31 684 3 470<br class="">
<a href="mailto:jean-marc.jeckelmann@unibe.ch" class="">jean-marc.jeckelmann@unibe.ch</a></div>
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