74 BD FACSAria II User’s Guide
to zero to ensure that residual charges from adjoining drops do not degrade
the quality of side streams. The 4-Way Purity mode is recommended for
four-way sorting where precise deflection is required.
•In Yield mode, only the Yield Mask is used at its maximum value. Recovery
and yield are optimized at the expense of purity. The yield mode could be
used as a first round sort for enrichment of target particles, followed by a
sort for purity.
• In Single Cell mode, the Purity Mask is set to the maximum, so only drops
free of contaminating particles will be sorted. The Phase Mask is set to half
the maximum, so only particles centered within the sorted drop are
deflected. Drop trajectory and count accuracy are optimized at the expense
of yield. This mode is recommended for plate sorting or situations where
precise counting is required.
The remaining modes are used mainly during drop delay determination. Initial
mode is equivalent to Yield mode, but it is named differently as a reminder to use
this as the initial mode when using Accudrop to set the drop delay.
•In Initial mode, only the Yield Mask is used at its maximum value.
Recovery and yield are optimized at the expense of purity.
•In Fine Tune mode, all masks are set to zero to deflect the maximum
number of drops. This mode is used to fine-tune the drop delay value. See
Determining the Drop Delay – Manual Method on page 166 for more
information.
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