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  2. Test tube - Wikipedia

    en.wikipedia.org/wiki/Test_tube

    Vacutainer. Boiling tube. Centrifuge tube. A test tube, also known as a culture tube or sample tube, is a common piece of laboratory glassware consisting of a finger-like length of glass or clear plastic tubing, open at the top and closed at the bottom. Test tubes are usually placed in special-purpose racks .

  3. Vacutainer - Wikipedia

    en.wikipedia.org/wiki/Vacutainer

    Vacutainer. A vacutainer blood collection tube is a sterile glass or plastic test tube with a colored rubber stopper creating a vacuum seal inside of the tube, facilitating the drawing of a predetermined volume of liquid. Vacutainer tubes may contain additives designed to stabilize and preserve the specimen prior to analytical testing.

  4. Test tube rack - Wikipedia

    en.wikipedia.org/wiki/Test_tube_rack

    Test tube racks are laboratory equipment used to hold upright multiple test tubes at the same time. They are most commonly used when various different solutions are needed to work with simultaneously, for safety reasons, for safe storage of test tubes, and to ease the transport of multiple tubes. Test tube racks also ease the organization of ...

  5. Signal-to-noise ratio - Wikipedia

    en.wikipedia.org/wiki/Signal-to-noise_ratio

    The plots at the bottom show the signal intensity in the indicated row of the image (red: original signal, blue: with noise). Signal-to-noise ratio ( SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise. SNR is defined as the ratio of signal power to noise power ...

  6. Test tube holder - Wikipedia

    en.wikipedia.org/wiki/Test_tube_holder

    A test tube holder is used to hold test tubes. [ 1] It is used for holding a test tube in place [ 2] when the tube is hot or should not be touched. [ 3] For example, a test tube holder can be used to hold a test tube while it is being heated. [ 4] Moreover, when heating the tube with liquid or solid contained inside, the holder ought to tightly ...

  7. Physics of whistles - Wikipedia

    en.wikipedia.org/wiki/Physics_of_whistles

    a disturbance, which supplies the oscillations to be amplified; a means of generating sound or other oscillatory fluid Brownian motion; a means for feedback of that oscillatory motion as a disturbance to the input of the amplifier. Whistles are in this category. There are several ways to describe the feedback process.

  8. Laboratory sample tube - Wikipedia

    en.wikipedia.org/wiki/Laboratory_sample_tube

    Laboratory sample tube. Laboratory sample tubes are used to hold small quantities of substances undergoing experimentation or testing. These tubes are usually made of glass, but can also be made of plastic or metal. They vary in size and purpose. Laboratory sample tubes must not be confused with glass tubing, which can be utilized to carry ...

  9. Microplate - Wikipedia

    en.wikipedia.org/wiki/Microplate

    Microplate. Microtiter plates with 96, 384 and 1536 wells. A microplate, also known as a microtiter plate, microwell plate or multiwell, [1] is a flat plate with multiple "wells" used as small test tubes. The microplate has become a standard tool in analytical research and clinical diagnostic testing laboratories.

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