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ccharlien
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jmren3361
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4Â¥2013-01-09 12:51:38
jmren3361
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hqsinberg
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hqsinberg
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7Â¥2013-01-09 13:12:29
real-gold
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8Â¥2013-01-11 10:32:00
hqsinberg
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ΪÁ˱í´ï׼ȷÎÒÀ´¸öÍâÎĵÄÔÎÄ£¨Âé·³×Ô¼º·Ò룬ÒÔÃâ±ðÈ˵IJúÉúÎó½â£¬Ô°æµÄÍâÎÄ·Ö×ÓÉúÎïѧ£¬¾ø¶Ô´í²»ÁË¡££©SYBR® Green monitors the total amount of double-stranded DNA but cannot dis-tinguish between different sequences. To be sure that the correct target sequence is being amplified a sequence specific fluorescent probe is needed. An example is theTaqMan® probe (Applied Biosystems, Foster City, CA). The TaqMan® probe consistsof two fluorophores linked by a DNA sequence that will hybridize to the middle of the target DNA. Fluorescence resonance energy transfer (FRET) transfers the energy from the short-wavelength fluorophore on one end to the long wavelength fluorophore at the other end. This quenches the short wave emission. During PCR the TaqMan® probe binds to the target sequence after the denaturation step that separates the two DNA strands. As the Taq polymerase extends the primer during the next PCR cycle it will eventually bump into the TaqMan® probe.The Taq poly-merase is not only capable of displacing strands ahead of it but also has a 5¡®-nuclease activity that degrades the DNA strand of the probe.This breaks the linkage between the two fluorophores and disrupts the FRET. The short-wavelength fluorophore is now free from quenching and its fluorescence increases. In this case the increase in fluorescence is directly related to the amount of the specific target sequence that has been amplified¡£ |
9Â¥2013-01-11 12:43:00














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