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    • 10. 发明授权
    • Detection of nucleic acids by fluorescence quenching
    • 通过荧光猝灭检测核酸
    • US6054279A
    • 2000-04-25
    • US120916
    • 1998-07-20
    • James G. NadeauJ. Bruce PitnerJames L. SchramC. Preston LinnGlenn P. VonkG. Terrance Walker
    • James G. NadeauJ. Bruce PitnerJames L. SchramC. Preston LinnGlenn P. VonkG. Terrance Walker
    • G01N21/64C07H21/00C12N15/09C12Q1/68G01N33/58C21Q1/68
    • C12Q1/6818C12Q1/6825
    • Single-stranded signal primers are modified by linkage to two dyes which form a donor/acceptor dye pair. The two dyes are positioned in sufficiently close spatial proximity on the signal primer that the fluorescence of the first dye is quenched by the second dye. The signal primer may further comprise a restriction endonuclease recognition site (RERS) between the two dyes. As the signal primer is initially single-stranded and remains single-stranded in the absence of target, the restriction endonuclease recognition site is not cleavable or nickable by the restriction endonuclease. In the presence of target, however, signal primer and the restriction endonuclease recognition site are rendered double-stranded and cleavable or nickable by the restriction endonuclease. Cleavage or nicking separates the two dyes and a change in fluorescence due to decreased quenching is detected as an indication of the presence of the target sequence or of target sequence amplification.
    • 通过连接到形成供体/受体染料对的两种染料来修饰单链信号引物。 这两种染料位于信号引物足够接近的空间上,第一种染料的荧光被第二种染料淬灭。 信号引物还可以包含两种染料之间的限制性内切核酸酶识别位点(RERS)。 由于信号引物最初是单链的,并且在不存在靶标的情况下保持单链,限制性内切核酸酶识别位点不受限制性内切核酸酶的切割或切割。 然而,在靶的存在下,信号引物和限制性内切核酸酶识别位点被限制性内切核酸酶双链和切割或切割。 切割或切口分离两种染料,并且由于猝灭降低引起的荧光变化被检测为目标序列或靶序列扩增的存在的指示。