Re: Distance between sort streams

Dennis_Young@CIS.ucsd.edu
Fri, 13 Sep 1996 10:38:00 -0700

---------------------------- Forwarded with Changes ---------------------------
From: Dennis Young at CIS
Date: 9/12/96 1:35PM
To: cyto-inbox
Subject: Re: Distance between sort streams
-------------------------------------------------------------------------------
Assuming that your high voltage is not defective (you need a special volt
meter probe to find out!), I found that the Sheath Pressure recommended in
the BDIS manuals is too high. If you slow down the stream to the
theoretical value (available from Scripp's Web site), the drops accumulate
more charge and separate better.

For example, 70 um, 27,500 Hz, 12 drops, 3 volt amplitude, the distance
will be around 3.8 mm.

http://facs.scripps.edu/optplus.html
See also:
Flow Cytometry: Intrumentation and Data Analysis,Eds. Van Dilla, Dean, Laerum, &
Melamed, 1985, Academic Press.

Based on the above, I see about TWICE the deflection distance with the optimal
droplet formation than what I see with BDIS settings.
This does slow down the Jet Stream, so sort speed may be slightly effected.

Dennis
*****************************************************************************
* Dennis J. Young Voice : (619) 822-0407 *
* Flow Cytometry Core Facility FAX : (619) 822-0412 *
* University of California, San Diego USA e-mail: djyoung@ucsd.edu *
*****************************************************************************
_____________________________ Reply Separator _________________________________
Subject: Distance between sort streams
Author: yagrawal@messi.uku.fi at @UCSD
Date: 9/12/96 8:25 AM

Hi everybody,
I request some advice regarding sorting.
Question: We use a FACStar for sorting. However, inspite of my best
efforts I am not able to get the Left and Right Streams to separate much
from the center stream. As a result the sorted cells miss the collection
tubes. (The left and rt. stream deflection controls are turned to max).

- Does the angle between the 2 charged metal plates (which is adjustable)
have anything to do with it ?.
- Any other suggestions would be welcome.

Many thanks in advance.

Yash Pal Agrawal
Dept. of Clinical Chemistry,
Kuopio Univ Hospital,
Finland.

E-mail:yagrawal@messi.uku.fi

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