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    • 21. 发明授权
    • Flip out fuse assembly
    • 翻转保险丝组件
    • US4827374A
    • 1989-05-02
    • US123252
    • 1987-11-20
    • John J. Dunn
    • John J. Dunn
    • H01H31/12H02B11/26H02B1/14
    • H02B11/26H01H31/122
    • A dead front fuse mounting assembly supports the fuse on a hingedly mounted plate which can pivot through a 90.degree. arc to allow access to the fuse. The plate can be latched in a circuit closed position and cannot be released therefrom until a high voltage elbow connector is removed from across a latch operator. Pivotal motion of the plate from the closed circuit position disengages the fuse from a second high voltage contact and releases a shutter to isolate this contact from the remainder of the fuse enclosure. The shutter is opened when the plate pivots back to its closed circuit position.
    • 死前保险丝安装组件将保险丝支撑在铰接安装的板上,该板可以通过90°电弧转动以允许接近保险丝。 板可以锁定在电路闭合位置,并且不能从板上释放,直到高压弯头连接器从闩锁操作器上移除。 板从闭合位置的枢轴运动使熔丝与第二高压接触脱离,并释放快门以将该接触与保险丝外壳的其余部分隔离。 当板旋转回其闭合位置时,快门打开。
    • 30. 发明授权
    • Method for introducing unidirectional nested deletions
    • 引入单向嵌套缺失的方法
    • US5928908A
    • 1999-07-27
    • US966958
    • 1997-11-10
    • John J. DunnMark A. QuesadaMatthew Randesi
    • John J. DunnMark A. QuesadaMatthew Randesi
    • C12N15/10C12N15/64
    • C12N15/102
    • Disclosed is a method for the introduction of unidirectional deletions in a cloned DNA segment. More specifically, the method comprises providing a recombinant DNA construct comprising a DNA segment of interest inserted in a cloning vector, the cloning vector having an f1 endonuclease recognition sequence adjacent to the insertion site of the DNA segment of interest. The recombinant DNA construct is then contacted with the protein pII encoded by gene II of phage f1 thereby generating a single-stranded nick. The nicked DNA is then contacted with E. coli Exonuclease III thereby expanding the single-stranded nick into a single-stranded gap. The single-stranded gapped DNA is then contacted with a single-strand-specific endonuclease thereby producing a linearized DNA molecule containing a double-stranded deletion corresponding in size to the single-stranded gap. The DNA treated in this manner is then incubated with DNA ligase under conditions appropriate for ligation. Also disclosed is a method for producing single-stranded DNA probes. In this embodiment, single-stranded gapped DNA, produced as described above, is contacted with a DNA polymerase in the presence of labeled nucleotides to fill in the gap. This DNA is then linearized by digestion with a restriction enzyme which cuts outside the DNA segment of interest. The product of this digestion is then denatured to produce a labeled single-stranded nucleic acid probe.
    • 公开了在克隆的DNA片段中引入单向缺失的方法。 更具体地,该方法包括提供包含插入克隆载体中的目标DNA片段的重组DNA构建体,该克隆载体具有与感兴趣的DNA片段的插入位点相邻的f1内切核酸酶识别序列。 然后将重组DNA构建体与由噬菌体f1的基因II编码的蛋白质pII接触,从而产生单链切口。 然后将切口的DNA与大肠杆菌外切核酸酶III接触,从而将单链缺口扩大为单链间隙。 然后将单链间隙DNA与单链特异性内切核酸酶接触,从而产生含有与单链间隙大小相对应的双链缺失的线性化DNA分子。 然后以适合于连接的条件,用这种方式处理的DNA与DNA连接酶一起温育。 还公开了用于生产单链DNA探针的方法。 在该实施方案中,如上所述制备的单链间隙DNA在DNA标记的核苷酸的存在下与DNA聚合酶接触以填充间隙。 然后通过用限制性内切酶消化DNA直接切割该DNA,该限制性内切酶在感兴趣的DNA片段之外。 然后将该消化产物变性以产生标记的单链核酸探针。