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<p class="MsoNormal" style="text-align:justify"><span lang="en-NL">Dear all, <o:p>
</o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span lang="en-NL">In our lab we have grown mammalian cells successfully on holey carbon R2/2 200 mesh gold</span><span lang="en-NL">
</span><span lang="en-NL">grids</span><span lang="en-NL"> </span><span lang="en-NL">(Quantifoil)</span><span lang="en-NL">
</span><span lang="en-NL"> for some time now. However, a few months ago we started having problems with cells not attaching, spreading, or not looking happy on the grid. In case the mitochondria of the cells were stained with MitoTracker, these sometimes looked
normal, but often smeared out/bloated. This differed greatly per experiment. We hypothesized that something might be wrong with the grids.
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span lang="en-NL">To figure out what was going on, we conducted an experiment where we in parallel seeded cells on glass, continuous carbon (gold, 200 mesh</span><span lang="en-NL">, Quantifoil</span><span lang="en-NL">)
or the presumably faulty</span><span lang="en-NL">/toxic</span><span lang="en-NL"> R2/2 (gold, 200 mesh</span><span lang="en-NL">, Quantifoil</span><span lang="en-NL">) and stained with MitoTracker. Some grids were washed either in ethyl acetate/ethanol/MilliQ
or ethyl acetate/acetone/chloroform and ethanol/MilliQ prior to seeding. The mitochondria of the cells seeded on glass and on the continuous carbon looked fine, but the mitochondria of the cells on the R2/2 both unwashed and for
</span><span lang="en-NL">the</span><span lang="en-NL"> washing protocols looked smeared out/bloated.
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify">We were wondering whether anyone else lately has had trouble with cell seeding on grids or has any suggestions on other washing protocols?
<span lang="en-NL">Alternatively, would it be useful to try on Protochips c-flat grids instead?</span><span lang="en-NL">
</span><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><span lang="en-NL">Kind regards, <o:p>
</o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span lang="en-NL">Leanne</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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