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    • 8. 发明授权
    • Detection of nucleic acids by strand displacement
    • 通过链置换检测核酸
    • US06261784B1
    • 2001-07-17
    • US09599164
    • 2000-06-22
    • James G. NadeauHelen V. HsiehJ. Bruce PitnerC. Preston Linn
    • James G. NadeauHelen V. HsiehJ. Bruce PitnerC. Preston Linn
    • C12Q168
    • C12Q1/6818C12Q2537/1373C12Q2531/143C12Q2531/119
    • Detector nucleic acids are employed for detection of nucleic acid target sequences by fluorescence quenching mechanisms. The detector nucleic acid comprises at least two oligonucleotides and is partially single-stranded and partially double-stranded. One of the two dyes of a donor/acceptor dye pair is linked to the first oligonucleotide and the other is linked to a second oligonucleotide such that they are in close spatial proximity when the first and second oligonucleotides are base-paired and donor fluorescence is quenched. A single second oligonucleotide may be hybridized to the first oligonucleotide or multiple second oligonucleotides may be hybridized to the first oligonucleotide and to each other, forming a junction structure comprising multiple donor/acceptor dye pairs. The detector oligonucleotide retains its partially single-stranded and partially double-stranded conformation in the absence of target. In the presence of target, however, the second oligonucleotide(s) of the detector nucleic acid is/are completely or partially displaced from the first, increasing the distance between the donor and acceptor dyes and causing a change in fluorescence which may be detected as an indication of the presence of the target sequence.
    • 检测器核酸用于通过荧光猝灭机制检测核酸靶序列。 检测器核酸包含至少两个寡核苷酸并且是部分单链和部分双链的。 供体/受体染料对的两种染料之一与第一寡核苷酸连接,另一种与第二寡核苷酸连接,使得当第一和第二寡核苷酸是碱基配对并且供体荧光淬灭时它们处于紧密的空间接近 。 单个第二寡核苷酸可以与第一寡核苷酸杂交,或者多个第二寡核苷酸可以与第一寡核苷酸和彼此杂交,形成包含多个供体/受体染料对的连接结构。 检测器寡核苷酸在不存在目标时保留其部分单链和部分双链构象。 然而,在靶存在下,检测器核酸的第二寡核苷酸与第一寡核苷酸完全或部分位移,从而增加供体和受体染料之间的距离并引起荧光的变化,其可被检测为 指示靶序列的存在。
    • 9. 发明授权
    • Detection of nucleic acids by fluorescence quenching
    • 通过荧光猝灭检测核酸
    • US6130047A
    • 2000-10-10
    • US235583
    • 1999-01-22
    • James G. NadeauHelen V. HsiehJ. Bruce PitnerC. Preston Linn
    • James G. NadeauHelen V. HsiehJ. Bruce PitnerC. Preston Linn
    • G01N21/64C07H21/00C12N15/09C12Q1/68G01N33/542G01N33/566C07H21/04C12P19/34
    • C12Q1/6818
    • Detector nucleic acids are employed for detection of nucleic acid target sequences by fluorescence quenching mechanisms. The detector nucleic acid comprises at least two oligonucleotides and is partially single-stranded and partially double-stranded. One of the two dyes of a donor/acceptor dye pair is linked to the first oligonucleotide and the other is linked to a second oligonucleotide such that they are in close spatial proximity when the first and second oligonucleotides are base-paired and donor fluorescence is quenched. A single second oligonucleotide may be hybridized to the first oligonucleotide or multiple second oligonucleotides may be hybridized to the first oligonucleotide and to each other, forming a junction structure comprising multiple donor/acceptor dye pairs. The detector oligonucleotide retains its partially single-stranded and partially double-stranded conformation in the absence of target. In the presence of target, however, the second oligonucleotide(s) of the detector nucleic acid is/are completely or partially displaced from the first, increasing the distance between the donor and acceptor dyes and causing a change in fluorescence which may be detected as an indication of the presence of the target sequence.
    • 检测器核酸用于通过荧光猝灭机制检测核酸靶序列。 检测器核酸包含至少两个寡核苷酸并且是部分单链和部分双链的。 供体/受体染料对的两种染料之一与第一寡核苷酸连接,另一种与第二寡核苷酸连接,使得当第一和第二寡核苷酸是碱基配对并且供体荧光淬灭时它们处于紧密的空间接近 。 单个第二寡核苷酸可以与第一寡核苷酸杂交,或者多个第二寡核苷酸可以与第一寡核苷酸和彼此杂交,形成包含多个供体/受体染料对的连接结构。 检测器寡核苷酸在不存在目标时保留其部分单链和部分双链构象。 然而,在靶存在下,检测器核酸的第二寡核苷酸与第一寡核苷酸完全或部分位移,从而增加供体和受体染料之间的距离并引起荧光的变化,其可被检测为 指示靶序列的存在。
    • 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。