CELL-DYN
®
3200 System Operator’s Manual
3-9
9140181H—October 2001
Section 3
Principles of Operation
Figure 3.2 Optical Flow Cell
Optical Flow Cell
In a flow cytometer, the cell suspension is transferred from the mixing chamber
through a sample tube into a special
flow chamber
with a small opening at the tip. The
suspension is then injected into a stream of fast-moving, cell-free liquid
(sheath
fluid)
. Since the two liquids travel at different rates of speed, they do not
intermingle. The special geometry of the flow cell and the flow rate of the sheath
fluid forces the cells into single file. This process is known as
hydrodynamic
focusing
. (Refer to Figure 3.2 for a drawing of the Optical Flow Cell.)
As the cells enter the
view volume
(specific viewing area), they intersect with the
laser beam. The different types of cells scatter the laser light at different angles,
yielding information about cell size, internal structure, granularity and surface
morphology. The optical signals the cells generate are detected and converted to
electrical impulses which are then stored and analyzed by the computer.
Flow cytometers generally measure two angles of scatter.
Forward angle light
scatter
is a measure of cell size.
Side angle (orthogonal) light scatter
is a measure
of cell surface and internal structure but is primarily a measurement of internal
granularity. Combining the information from the two scatter measurements
provides more accurate discrimination between cell populations than either single
measurement. (See Fig. 3.3 for an example of the light scatter measured by the
CELL-DYN 3200.)
1 Sample Feed Nozzle
2 Sheath Stream
3 Sample Stream
4 Focused Laser Beam
5 Various Angles of
Scattered Light
4
1
5
3
2
Содержание CELL-DYN 3200
Страница 12: ...xii CELL DYN 3200 System Operator s Manual 9140181K July 2002 NOTES ...
Страница 52: ...1 4 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Use or Function Overview Section 1 NOTES ...
Страница 132: ...3 38 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Principles of Operation References Section 3 NOTES ...
Страница 154: ...5 2 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Operating Instructions Overview Section 5 NOTES ...
Страница 234: ...5 82 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Operating Instructions Run Menu Section 5 NOTES ...
Страница 300: ...6 2 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Calibration Procedures Overview Section 6 NOTES ...
Страница 356: ...6 58 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Calibration Procedures References Section 6 NOTES ...
Страница 362: ...8 2 CELL DYN 3200 System Operator s Manual 9140181K July 2002 Hazards Overview Section 8 NOTES ...
Страница 370: ...8 10 CELL DYN 3200 System Operator s Manual 9140181K July 2002 Hazards References Section 8 NOTES ...
Страница 372: ...9 2 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Service and Maintenance Overview Section 9 NOTES ...
Страница 532: ...11 2 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Quality Control Overview Section 11 NOTES ...
Страница 558: ...11 28 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Quality Control References Section 11 NOTES ...
Страница 560: ...12 2 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Printers Overview Section 12 NOTES ...
Страница 566: ...13 2 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Sample Loader Overview Section 13 NOTES ...
Страница 590: ...14 2 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Reticulocyte Package Overview Section 14 NOTES ...
Страница 662: ...A 4 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Bar Codes Overview Appendix A NOTES ...
Страница 666: ...A 8 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Bar Codes Specifications Appendix A NOTES ...