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<div>Thought the same. Maybe old UA or out in the light too long?<br>
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<div>Cheers,</div>
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Jaap
<div>----
<div>Jacob Brink <span style="font-size: 13pt;">Ph.D.</span></div>
<div><span style="font-size: 13pt;">TEM Product Manager Life Sciences</span></div>
<div><span style="font-size: 13pt;">JEOL USA, Inc., Peabody MA 01960</span></div>
<div><span style="font-size: 13pt;">(978) 317-9561</span></div>
<div><span style="font-size: 13pt;"><br>
</span></div>
<div>Sent from mobile device. Please excuse typos and this reply's brevity as I'm using all thumbs to type :-)</div>
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On Sep 24, 2017, at 3:41 PM, Sacha De Carlo <<a href="mailto:sacha.decarlo@dectris.com">sacha.decarlo@dectris.com</a>> wrote:<br>
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<div>Looks like UA precipitate. </div>
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<div id="AppleMailSignature">Best regards</div>
<div id="AppleMailSignature">Sacha <br>
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<div>Sent from my mobile device</div>
<div>-----------------------------</div>
<div>Sacha De Carlo, Ph.D. </div>
<div>Business Development EM</div>
<div><a href="http://Dectris.com">Dectris.com</a></div>
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On 24 Sep 2017, at 23:26, Linda Sandblad <<a href="mailto:linda.sandblad@umu.se">linda.sandblad@umu.se</a>> wrote:<br>
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<p class="MsoNormal">Hi all experts!!</p>
<p class="MsoNormal">I know, this do not look nice, but I would like to hear your opinion about this artifact. Tiny dark spots covering both sample and background, do you know what it is, were it comes from and how to avoid it? We have this bad background time
to time from different labs…. It is a “normal” negative staining protocol: copper grids, formvar, carbon, glow discharge, UA.</p>
<p class="MsoNormal">I’m happy for your suggestions, Best Linda</p>
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Linda Sandblad<br class="">
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Department of Molecular Biology<br class="">
Umeå University<br class="">
+46 709324936</div>
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