Unique DNA fragment
found only in the target
organism.
As temperature rises,
double-stranded DNA
separates.
As temperature cools,
primers anneal to
single DNA strands and
polymerase extends the
primers.
At the end of the first
cycle, two fragments
are formed—one with
and one without an
attached scorpion.
As the temperature rises,
the scorpion unwinds.
This will allow the probe
section to attach to the
fragment during cooling in
the next step.
Greater distance between
the two dyes allows the
fluorophore to emit signal
on that fragment as the
other fragments repeat
the extension.
With each successive
cycler, increasing
numbers of strands
contain the unwound
scorpion, increasing the
signal to detectable
levels in less than
an hour.
Unique DNA fragmentfound only in the targetorganism.As temperature rises,double-stranded DNAseparates.As temperature cools,primers anneal tosingle DNA strands andpolymerase extends theprimers.At the end of the firstcycle, two fragmentsare formed—one withand one without anattached scorpion.As the temperature rises,the scorpion unwinds.This will allow the probesection to attach to thefragment during cooling inthe next step.Greater distance betweenthe two dyes allows thefluorophore to emit signalon that fragment as theother fragments repeatthe extension.With each successivecycler, increasingnumbers of strandscontain the unwoundscorpion, increasing thesignal to detectablelevels in less thanan hour.
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