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number

 [num´ber]
a symbol, as a figure or word, expressive of a certain value or a specified quantity determined by count.
atomic number (Z) a number expressive of the number of protons in an atomic nucleus, or the positive charge of the nucleus expressed in terms of the electronic charge.
Avogadro's number (N) (NA) the number of molecules in one mole of a substance: 6.023 × 1023. Called also Avogadro's constant.
CT number the density assigned to a voxel in a CAT scan on an arbitrary scale on which air has a density −1000; water, 0; and compact bone +1000. See also hounsfield unit.
mass number (A) the number of nucleons (protons plus neutrons) in the atom of a nuclide; generally indicated by a superscript preceding the symbol of a chemical element (e.g., 131I), denoting a specific isotope.
oxidation number a number assigned to each atom in a molecule or ion that represents the number of electrons theoretically gained (positive oxidation numbers) or lost (negative numbers) in converting the atom to the elemental form.

Z

Abbreviation for benzyloxycarbonyl (carbobenzoxy-); symbol for an amino acid that is either glutamic acid, glutamine, or a substance that yields glutamic acid on acid hydrolysis of peptides (for example, 4-carboxyglutamate or 5-oxyproline); carbobenzoxy; in italics, zusammen.

Z

Abbreviation for atomic number.

z

Abbreviation for zepto-.

Z

/Z / atomic number; impedance.

Z

Symbol for:
1. Atomic number.
2. Aza–a nucleoside substitite.
3. Glutamic acid and glutamine.
4. Impedance.
5. Drug slang A street term for 1 ounce–
28 g. of heroin.
6. Net charge.
7. Proton number.
8. Zone.

Z

Abbreviation for benzyloxycarbonyl; atomic number.

z

Abbreviation for zepto-.

Z

abbrev. for either GLUTAMINE (Q) or GLUTAMIC ACID (E) where the amino acid residue in the protein cannot be distinguished as Q or E or varies between Q and E.