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<DIV dir=ltr align=left><SPAN class=909430920-19102015><FONT
color=#0000ff>David,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=909430920-19102015><FONT
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=909430920-19102015><FONT color=#0000ff>Are
you sure there wasn't a smudge on one the windows from someone's thumb as they
assembled the cell?</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=909430920-19102015><FONT
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=909430920-19102015><FONT
color=#0000ff>Karl</FONT></SPAN></DIV><BR>
<DIV lang=en-us class=OutlookMessageHeader dir=ltr align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> RASMB
[mailto:rasmb-bounces@list.rasmb.org] <B>On Behalf Of </B>David
Hayes<BR><B>Sent:</B> Monday, October 19, 2015 11:14 AM<BR><B>To:</B>
RASMB<BR><B>Subject:</B> [RASMB] Strange AUC noise<BR></FONT><BR></DIV>
<DIV></DIV>
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<DIV id=yui_3_16_0_1_1445277124881_2742>Hi all,</DIV>
<DIV id=yui_3_16_0_1_1445277124881_2742><BR></DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751>We had some strange AUC noise in a
recent experiment. In the pictures below from SEDFIT, the first two runs
produced data as in the picture NNBekman1 (the IT guys name our instruments and
they pruposely mispelled Beckman as Bekman years ago). A strange noise pattern
showed up in the scans that were produced on day one. Then the sample was
loaded into a new cell and run again on the same centrifuge producing the
strange noise pattern in the picture called NNBekman1. the filled cell
was taken and gently mixed and then run on another centrifuge Bekman17 and made
a perfectly fine patter shown in picture Beckman17.</DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751><BR></DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751>We have seen the strange noise before on
our NNBekman1 centrifuge, but this is the first time on NNBekman2.</DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751><BR></DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751>Has anyone seen noise like this?
</DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751>Any theories on the cause of the
noise?</DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751><BR></DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751>It certainly looks like an optical
artifact of some kind, but the time dependence is hard to explain.</DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751><BR></DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751>Kind Regards,</DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751><BR></DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751>David Hayes</DIV>
<DIV id=yui_3_16_0_1_1445277124881_2751><BR></DIV>
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