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    • 28. 发明授权
    • Pulsed field gel electrophoresis of large DNA
    • 大DNA的脉冲场凝胶电泳
    • US5135628A
    • 1992-08-04
    • US348679
    • 1989-05-05
    • Robert W. Allington
    • Robert W. Allington
    • G01N27/447
    • G01N27/44773
    • An electrophoresis apparatus 10 has a power supply 12, an electrophoresis gel system including the tank 85 and an adjustable switching means 42 connected together for controlling the electric field force, electric field angle and the pulse duration to resolve DNA molecules greater than 1,000 kb in length along straight, unbent lanes within a gel. The electrophoresis system 10 permits adjustment of the pulse durations through a range from generally one-tenth of a second to shorter ranges. It permits the adjustability of the electric field force, electric field angle and the pulse duration so that it may have: (1) pulse durations in a range that maintains the pulse durations shorter than one-tenth of a second; (2) an angle or angles of two fields up to 180 degrees with respect to each other; (3) a side range of intensities of the fields; and (4) any number of repetitions of pulses of the fields before changing the angle of the two fields with respect to each other.
    • 电泳装置10具有电源12,电泳凝胶体系,其包括容器85和连接在一起的可调开关装置42,用于控制电场力,电场角和脉冲持续时间,以解析长度大于1000kb的DNA分子 沿着凝胶内的直线,未穿过的泳道。 电泳系统10允许脉冲持续时间的调整范围通常在十分之一到更短的范围内。 它允许电场力,电场角和脉冲持续时间的可调性,使得它可以具有:(1)在保持脉冲持续时间短于十分之一秒的范围内的脉冲持续时间; (2)相对于彼此高达180度的两个场的角度或角度; (3)场的强度的侧面范围; 和(4)在改变两个场相对于彼此的角度之间的任意数量的场的脉冲重复。
    • 29. 发明授权
    • Chromatographic system
    • 色谱系统
    • US5080785A
    • 1992-01-14
    • US523475
    • 1990-05-15
    • Robert W. AllingtonJohn N. Jones
    • Robert W. AllingtonJohn N. Jones
    • G01N30/34
    • G01N30/34
    • To prevent the solvents forming a gradient from mixing at the wrong place and to provide for accurate composition at start of the gradient in spite of solvent pressure variations, a microliquid or supercritical fluid chromatograph includes a combined mixer and pressure detector in which equal pressures of the two solvents in the gradient are detected by displacement of a ferromagnetic poppet in the mixing chamber. The poppet serves as a stop for the final solvent until the pressures are substantially equal and then its movement is detected by a circuit related to a linear variable differential transformer. The signal energizes a circuit which drives one of the sensing coils to drive the poppet during the gradient to provide mixing.
    • 为了防止形成梯度的溶剂在错误的地方混合,并且尽管有溶剂压力变化而在梯度开始时提供精确的组成,但微液体或超临界流体色谱仪包括组合的混合器和压力检测器,其中相同的压力 梯度中的两种溶剂通过在混合室中的铁磁提升阀的位移来检测。 提升阀作为最终溶剂的停止点,直到压力基本相等,然后通过与线性可变差动变压器相关的电路检测其运动。 该信号激励驱动其中一个感测线圈的电路,以在梯度期间驱动提升阀以提供混合。
    • 30. 发明授权
    • Pumping system
    • 抽水系统
    • US4964533A
    • 1990-10-23
    • US713328
    • 1985-03-18
    • Robert W. AllingtonJon L. CurranJerold B. Schmidt
    • Robert W. AllingtonJon L. CurranJerold B. Schmidt
    • F04B7/06F04B49/20
    • F04B49/20F04B7/06
    • To control with precision and repeatability the amount of fluid dispensed or aspirated by a pumping system, a volume disk rotates with the output shaft of a DC motor that drives a reciprocating dispensing pump. A sensor detects indicia on the disk and provides periodic signals spaced-apart in time by an amount: (1) an amount proportional to the volume of fluid pumped; (2) proportional to the angle between indicia; (3) less than one-third of the length of the total stroke of the piston as the piston moves linearly in its working portion of a cycle; (4) necessary for the piston to sweep out a volume of less than five milliliters. The speed of the pump is controlled by a second disk having equally spaced indicia that are sensed to provide signals proportional to the motor speed. During dispensing or aspirating large volumes, the motor speed is increased to a high speed, run at the high speed and then decreased before stopping and during dispensing smaller volumes, it is maintained at a constant lower speed.
    • 为了以精确和可重复的方式控制由泵送系统分配或吸入的流体的量,体积盘与驱动往复式分配泵的直流电动机的输出轴一起旋转。 传感器检测盘上的标记,并提供周期性信号,时间间隔一定量:(1)与泵送的流体体积成比例的量; (2)与标记之间的角度成比例; (3)当活塞在其循环的工作部分中线性移动时,其活塞的总冲程长度的三分之一以下; (4)活塞排出的体积必须少于5毫升。 泵的速度由具有等间隔的标记的第二盘控制,该标记被感测以提供与电动机速度成比例的信号。 在分配或抽吸大量时,电机速度提高到高速,高速运行,然后在停止之前和分配较小的体积期间减少,它保持在恒定的较低速度。