[RASMB] Strange AUC noise

[Karl Maluf]

David,
 
Are you sure there wasn't a smudge on one the windows from someone's thumb
as they assembled the cell?
 
Karl

  _____  

From: RASMB [mailto:rasmb-bounces at list.rasmb.org] On Behalf Of David Hayes
Sent: Monday, October 19, 2015 11:14 AM
To: RASMB
Subject: [RASMB] Strange AUC noise


Hi all,

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.

We have seen the strange noise before on our NNBekman1 centrifuge, but this
is the first time on NNBekman2.

Has anyone seen noise like this?  
Any theories on the cause of the noise?

It certainly looks like an optical artifact of some kind, but the time
dependence is hard to explain.

Kind Regards,

David Hayes

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