College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Flow cytometry, illustrated as shown, is a technique used to sort cells by type. The cells are placed in a
from the charging collar, looking for the presence of certain types of cells. All droplets containing one particular type of cell are given the same charge by the charging collar. Droplets with other desired types of cells receive a different charge, and droplets with no desired cell receive no charge. The charged droplets then pass between two parallel charged electrodes where they receive a horizontal force that directs them into different collection tubes, depending on their charge.
Because the droplets are conductors, a droplet’s positive and negative charges will separate while the droplet is in the region between the deflection plates. Suppose a neutral droplet passes between the plates. The droplet’s dipole moment will point
A. Up. B. Down. C. Left. D. Right.
Transcribed Image Text:Nozzle
Liquid
Cells
stream
Laser
probe
Charging
collar
Deflection
plates
Collection
tubes
FIGURE P20.75
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