atomic mass unit

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atomic mass unit

or

amu,

in chemistry and physics, unit defined as exactly 1-12 the mass of an atom of carbon-12, the isotopeisotope
, in chemistry and physics, one of two or more atoms having the same atomic number but differing in atomic weight and mass number. The concept of isotope was introduced by F.
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 of carbon with six protons and six neutrons in its nucleus. One amu is equal to approximately 1.66 × 10−24 grams.
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Atomic mass unit

An arbitrarily defined unit in terms of which the masses of individual atoms are expressed. One atomic mass unit is defined as exactly of the mass of an atom of the nuclide 12C, the predominant isotope of carbon. The unit, also known as the dalton, is often abbreviated amu, and is designated by the symbol u. The relative atomic mass of a chemical element is the average mass of its atoms expressed in atomic mass units.

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.

atomic mass unit

[ə′täm·ik ′mas ′yü·nət]
(physics)
An arbitrarily defined unit in terms of which the masses of individual atoms are expressed; the standard is the unit of mass equal to one-twelfth the mass of the carbon atom, having as nucleus the isotope with mass number 12. Abbreviated amu. Also known as dalton.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

atomic mass unit

a unit of mass used to express atomic and molecular weights that is equal to one twelfth of the mass of an atom of carbon-12. It is equivalent to 1.66 × 10--27 kg
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
IB, rat [-] CYP-2C19 Pediatric IB, human [+] (55,9 kD) Ag, antigen; AIH, autoimmune hepatitis; AIH-drug, drug-induced AIH; AIH-APS-1, Type 1 Polyglandular Syndrome associated AIH; CYP, cytochrome P450; GSTT1, glutathione-S-transferase T1; IB, immunoblotting; 2D-IB, two-dimensional immunoblotting; ID, immunodiffusion; IF, immunofluorescence; kD, kilodaltons of Ag molecular weight; LKC, liver kidney cytosol antibody; LM, liver microsomal antibody; LKM, liver and kidney microsomal antibody; post-OLT AIH, postorthotopic liver transplantation "de novo" AIH; Pts, patients.
"In Teva, for example, the generic pharmaceutical maker, Sandoz, contended the phrase 'molecular weight of five to nine kilodaltons' in the patent was not specific or meaningful enough to lead to a valid patent claim.
"Our images show that CETP is a small (53 kilodaltons) banana-shaped asymmetric molecule with a tapered N-terminal domain and a globular C-terminal domain," Gang Ren, a materials physicist and electron microscopy expert with Berkeley Lab's Molecular Foundry, a DOE nanoscience research center, who led the study.
The team discovered that hydrolysis broke proteins down from 150-200 kilodaltons in size to about 10.
La biodisponibilidad de la nadroparina calcica se encuentra directamente relacionada con las cadenas de heparina de menos de 5 kilodaltons, segun algunos estudios, de 89 a 98%, con un area bajo la curva de 2,35 UI/ml por hora (tabla 1) [3,8].
tuberculosis-specific antigens, such as 6 kilodaltons ESAT-6 and culture filtrate protein CFP-10 of 10 kilodaltons (9,10).
CR1 molecular weight differs by approximately 30 kilodaltons (kDa), four different forms are known CR1*1 (220 kDa), CR1*2 (250 kDa), CR1*3 (190 kDa) and CR1*4 (280 kDa), arising by deletion and duplication of the complement control proteins (CCPs), mostly contained in the long homologous repeat-B (LHR-B) (13).
Most of the monomers serve as building blocks that undergo iterative dehydration reactions to generate mid-sized as well as long-chain polymers (several kilodaltons) that are proteins, DNA, RNA, carbohydrates, isoprenoids, and peptidoglycan (which makes up the cell wall).
Induction of adipocyte complement-related protein of 30 kilodaltons by PPAR[gamma] agonists: a potential mechanism of insulin sensitization.
The enzyme has a molecular weight of about 47.1 kilodaltons and has phytase activity.