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| a beam that is supported freely in the center and has two pans of equal weight suspended from its ends |
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| a gas burner consisting typically of a straight tube with small holes at the bottom where air enters and mixes with the gas to produce an intensely hot blue flame |
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| an instrument for determining temperature; especially : one consisting of a glass bulb attached to a fine tube of glass with a numbered scale and containing a liquid (as mercury or colored alcohol) that is sealed in and rises and falls with changes of temperature |
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| a deep widemouthed thin-walled vessel usually with a lip for pouring that is used especially in science laboratories |
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| a flat-bottomed conical laboratory flask |
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| a plain or lipped tube usually of thin glass closed at one end and used especially in chemistry and biology |
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| a tall narrow container with a volume scale used especially for measuring liquids |
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| a small shallow dish of thin glass or plastic with a loose cover used especially for cultures in bacteriology |
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| a mathematical variable that is independent of the other variables in an expression or function and whose value determines one or more of the values of the other variables |
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| Compound light microscope |
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| an electron-optical instrument in which a beam of electrons is used to produce an enlarged image of a minute object |
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| to incorporate controls in an experiment or study |
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| a plausible or scientifically acceptable general principle or body of principles offered to explain phenomena |
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| something obtained by calculation or investigation |
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| a tentative assumption made in order to draw out and test its logical or empirical consequences |
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| necessary consequence of two or more propositions taken as premises |
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| factual information (as measurements or statistics) used as a basis for reasoning, discussion, or calculation |
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| electrophoresis in which molecules (as proteins and nucleic acids) migrate through a gel and especially a polyacrylamide gel and separate into bands according to size |
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| a small and extremely fine-pointed pipette used in making microinjections |
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| an operation or procedure carried out under controlled conditions in order to discover an unknown effect or law, to test or establish a hypothesis, or to illustrate a known law |
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| any of various testing devices or substances |
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| a machine using centrifugal force for separating substances of different densities, for removing moisture, or for simulating gravitational effects |
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