atomic mass unit

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Related to Atomic mass units: Kilodalton, KDA
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unit of mass for expressing masses of atoms or molecules

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So while most mass specs can distinguish between compounds weighing between 407 and 408 atomic mass units (amu) and between 408 and 409 amu, for example, the FT-ICR-MS can detect a substance with a mass of 407.
Mass number of an isotope is equal to the numerical value of its mass, measured in atomic mass units (a.
The largest protein known, titin weighs in at 3 million atomic mass units, or 3 million times the weight of a hydrogen atom.
But this element has an atomic mass that is more than 200 atomic mass Units (amu).
Usually, a range of 1 to 50 atomic mass units (AMU) is sufficient unless heavy hydrocarbon contamination is expected.