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    • 4. 发明授权
    • Gravimetric diluter
    • 重量稀释剂
    • US4350186A
    • 1982-09-21
    • US232531
    • 1981-02-09
    • Samuel SchalkowskyDonald Whitley
    • Samuel SchalkowskyDonald Whitley
    • G01N1/38G01N35/00B65B3/28
    • G01N1/38G01N2035/00217
    • An apparatus for making dilutions of a sample with a diluent to a predetermined dilution factor f by weight of the diluent is disclosed. A scale with TARE capability produces an output signal of the weight W of a sample within a container less the weight of the container. A dilution factor control is provided for setting the predetermined dilution factor f. Means are provided for calculating and storing the value TW=W/f which is the total weight of the sample plus the weight of the diluent which is required to dilute the sample to the predetermined dilution factor f. A pump is connected between a reservoir of diluent and the container for the sample for pumping the amount of diluent into the container which is required to dilute the sample to the predetermined weight dilution factor f. The scale provides a continuous output of the weight W of the sample plus diluent in the container at any instant in time. Means are provided for calculating when TW-W=0. In one embodiment, the flow of diluent to the container is stopped by the stopping of the pump when TW-W=0. In another embodiment, the flow of diluent to the container is stopped by closing a pair of valves located between the pump and the container when TW-W=0.
    • 公开了一种用稀释剂稀释样品至稀释剂重量的预定稀释因子f的装置。 具有TARE能力的刻度产生容器内样品的重量W的输出信号,减小容器的重量。 提供稀释因子控制来设定预定的稀释因子f。 提供了用于计算和存储TW = W / f的值,该值是样品的总重量加稀释剂稀释液的稀释液的重量至预定的稀释因子f。 将泵连接在稀释剂储存器和用于样品的容器之间,用于将稀释剂稀释至预定重量稀释因子f所需的稀释剂量抽入容器中。 该刻度在任何时刻提供样品加重W和容器中的稀释剂的连续输出。 提供了在TW-W = 0时计算的方法。 在一个实施例中,当TW-W = 0时,通过停止泵来停止向容器的稀释剂流。 在另一个实施例中,当TW-W = 0时,通过关闭位于泵和容器之间的一对阀来停止向容器的稀释剂流。
    • 5. 发明授权
    • Method for measuring the bactericidal and bacteriostatic effects of
antimicrobial agents
    • US5563043A
    • 1996-10-08
    • US328160
    • 1994-10-24
    • Samuel SchalkowskyLeon G. Hunt
    • Samuel SchalkowskyLeon G. Hunt
    • C12Q1/06C12Q1/18C12Q1/24C12Q1/02
    • C12Q1/18
    • A method for measuring the combined bactericidal and bacteriostatic effects of an antimicrobial agent on the number of viable cells in a bacterial population exposed to an application-relevant concentration of the agent, with the rate of change of the number of viable cells as a function of different exposure intervals expressed on a per-drug-free division interval g.sub.0 (generation time) basis, so as to facilitate the assessment of projected therapeutic efficacy independent of the particular generation time used in the test environment. (2) A method for measuring the combined bactericidal and bacteriostatic effects of an antimicrobial agent on the acceleration of viable population change at a concentration corresponding to the Discrete Minimal Inhibitory Concentration (DMIC), when the size of the initial viable population remains essentially unchanged in the presence of the agent. (3) A method for measuring the bactericidal component of the effect of an antimicrobial agent from measurements of the initial viable population deposited on nutrient agar media and the number of visible colonies which formed from this deposit in the presence of a selected concentration of the antimicrobial agent. (4) A method for determining the value of the DMIC, and the rate of change of bactericidal activity with changing concentrations of the antimicrobial agent, by applying the method of (3) above at different concentrations of the antimicrobial agent; computing the probability of successful cell division from colony count data at the selected concentrations of the antimicrobial agent; evaluating the functional relationship between the probabilities of division and concentration of the agent; and obtaining from this function the value of the DMIC, the Minimum Cidal Concentration (MCC) where bactericidal activity begins and the rate of change of bactericidal activity with drug concentration.
    • 7. 发明授权
    • Method for testing the comparative effect of growth-affecting substances
by multiple depositions of test microorganisms
    • 通过多次沉积测试微生物测试生长影响物质的比较效果的方法
    • US5429944A
    • 1995-07-04
    • US751782
    • 1991-08-29
    • Samuel Schalkowsky
    • Samuel Schalkowsky
    • C12Q1/18C12Q1/00C12Q1/02C12Q1/04C12Q1/24
    • C12Q1/18Y10S435/809
    • A method for evaluating the comparative effect of growth-affecting substances, such as antimicrobial drugs or antibiotics, on different cultures of microorganisms is disclosed. The cultures are plated on the surface of a culture medium (12), such as agar, in adjacent at least partially separated tracks, such as tracks formed as Archimedes spirals. The cultures may be different concentrations of the same microbe or a test culture and a reference culture. The growth-affecting substances (22) are placed in contact with the culture medium on which the cultures have been plated preferably in the form of disks containing a powdered growth-affecting substance which dissolves and diffuses differentially into the culture medium to produce zones (24) of inhibition of growth extending radially outward from the disk. A comparison of the distance between the disk and the point of inhibition of the tracks of the different cultures which intersect the disk permits direct measurement of the comparative effects of the growth-affecting substance.
    • 公开了一种用于评估生长影响物质如抗微生物药物或抗生素对不同培养微生物的比较效果的方法。 将培养物铺在培养基(12)的表面上,例如琼脂,在相邻的至少部分分离的轨道,例如形成为阿基米德螺旋形的轨道上。 培养物可以是相同微生物或测试培养物和参照培养物的不同浓度。 生长影响物质(22)被放置成接触培养物的培养基,优选以包含粉末生长影响物质的盘的形式接触,所述粉末生长影响物质可以差异地溶解并扩散到培养基中以产生区域(24 )抑制从圆盘径向向外延伸的生长。 与圆盘之间的距离与与盘相交的不同培养物的轨迹的抑制点的比较允许直接测量生长影响物质的比较效果。
    • 9. 发明授权
    • Computer assisted biological assay system
    • 计算机辅助生物测定系统
    • US4637053A
    • 1987-01-13
    • US606886
    • 1984-05-03
    • Samuel Schalkowsky
    • Samuel Schalkowsky
    • C12M1/34G06M11/00G06K9/00C12Q1/18
    • G06M11/00C12M41/36
    • The present invention is an improved system for counting of bacterial colonies on a plate. The system permits the counting of colonies under adverse colony counting conditions where there is overlap of colonies and analyzes the plate in a plurality of segments. The colony counts for each segment are subjected to count correction, size qualification and distribution qualification to correct for missed counts and to eliminate data from the system data base when the count for a segment will not produce reliable data. The entire plate is also analyzed for subsample qualification which provides the best estimate of the bacteria containing liquid which was used to produce the colonies as represented by a coefficient of variation of the bacterial density in the liquid.
    • 本发明是一种用于计数板上细菌菌落的改进系统。 该系统允许在不利的菌落计数条件下计数集落,其中存在重叠的菌落并分析多个区段中的板。 对于每个段的殖民地计数经受计数校正,大小鉴定和分配限定,以校正错过的计数,并且当段的计数不会产生可靠的数据时,从系统数据库中消除数据。 还对整个板进行了子样品鉴定分析,其提供了用于产生菌落的细菌含量的最佳估计,以液体中细菌密度的变异系数表示。
    • 10. 发明授权
    • Method for testing microbial interaction with growth affecting substances
    • 微生物与生长影响物质相互作用的测试方法
    • US4514495A
    • 1985-04-30
    • US379281
    • 1982-05-18
    • Samuel SchalkowskyEllen R. Schalkowsky
    • Samuel SchalkowskyEllen R. Schalkowsky
    • C12Q1/02C12Q1/18C12M1/26C12Q1/24
    • C12Q1/18C12Q1/025Y10S435/809Y10S435/839
    • A method for testing microbial interaction with growth affecting substances. A pattern of a microbe containing solution is applied on an interaction plate in a programmed concentration. A solution of a growth interacting substance is applied on the interaction plate in a programmed potency in a pattern which contacts the microbe containing solution to cause contact of the microbes with the growth interacting substance. The resultant plate is incubated for a time sufficient to produce visible microbial colonies on the interaction plate. The potency of a growth interacting substance is determined at any point of interest on the incubated interaction plate by correlating the position of the point of interest with the programmed volume of the growth interacting substance deposited at that point.
    • 一种测试微生物与生长影响物质相互作用的方法。 将含有微生物的溶液的图案以编程浓度施加在相互作用板上。 生长相互作用物质的溶液以编程效能以与微生物含有溶液接触以使微生物与生长相互作用物质接触的图案施加在相互作用板上。 将所得板孵育足以在相互作用板上产生可见微生物菌落的时间。 通过将感兴趣点的位置与沉积在该点的生长相互作用物质的程序体积相关联,在培养的相互作用平台上的任何感兴趣点处测定生长相互作用物质的效力。