molecular mass

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Related to molecular mass: molecular formula, relative molecular mass

mo·lec·u·lar weight (mol wt, MW),

the sum of the atomic weights of all the atoms constituting a molecule; the mass of a molecule relative to the mass of a standard atom, now 12C (taken as 12.000). Relative molecular mass (Mr) is the mass relative to the dalton and has no units.
See also: atomic weight.

molecular mass

the mass of a molecule of a substance as compared with the mass of an atom of carbon-12. It is equal to the sum of the masses of its constituent atoms and is measured in daltons. Formerly called molecular weight. See also atom, atomic mass, molecule.


(mas) [L. massa, mass fr Gr. maza, (barley) cake]
1. A quantity of material, such as cells, that unite or adhere to each other.
2. Soft solid preparation for internal use and of such consistency that it may be molded into pills.
3. A fundamental scalar property of an object that describes the amount of acceleration an object will have when a given force is applied to it. The metric unit of mass is the kilogram. One kilogram equals 2.205 pounds. See: weight
4. Large, extensive, or encompassing an entire organ or population group (e.g., a mass vaccination).

cell mass

In embryology, the mass of cells that develops into an organ or structure.

epithelial mass

The inner portion of a developing gonad enclosed within the germinal epithelium.

fat mass

Total body fat. It can be measured with dual energy absorptiometry or bioelectrical impedance techniques.

fat-free mass

The lean body mass plus the skeletal mass.

formula mass

Gram molecular mass.

gram molecular mass

The mass or weight in grams of a substance equal to its molecular mass/weight.
Synonym: formula mass; gram molecular weight

inner cell mass

In embryology, the group of cells within the blastocyst from which the embryo, yolk sac, and amnion develop.
See: blastocyst

intermediate cell mass

A plate of nonsegmented mesoderm lying lateral to the segments (somites) and connecting them to the nonsegmented lateral mesoderm. Synonym: nephrotome

lateral mass of the atlas

The parts of the first cervical vertebra that articulate with the occipital bone superiorly and the axis inferiorly.

lean body mass

The weight of the body minus the fat content. It includes bones, muscles, and internal organs.

molecular mass

Molecular weight.

molecular mass,

References in periodicals archive ?
The proteins with high molecular masses (90 and 60 kDa) were present in medium B, but proteins with a molecular mass of about 30 kDa were absent in this environment (Figure 5, lanes 5, 6).
At constant salt content, Li-salt generates ascending antiplasti-cizing activity with increasing molecular mass.
Purification and molecular mass determination of a lipid transfer protein exuded from Vigna unguiculata seeds.
0 Table 4 Molecular mass and optimum pH and temperature of Agrocybe cylindracea laccase and several mushroom laccases against ABTS.
Effective diffusion coefficients and the molecular masses of the gases Effective diffusion coefficient Molecular mass (x [10.
Under denaturing and reducing conditions, monomeric CRP runs at an apparent molecular mass of about 25 kDa, which corresponds to the molecular mass of the CRP monomer.
The monomer of proPO has a relative molecular mass of 70-80kDa, with an active PO of 60-70 kDa (Aspan and Soderhall, 1991; Kopacek et al.
It was shown [3-16] that molecular mass and elemental composition of TB depend on bituminisation conditions.
WASHINGTON -- Quick -- calculate the molecular mass of silicon tetrachloride.
Unfortunately immunoassays for serum prolactin are also nonspecific; in addition to detecting the free, monomeric form of circulating PRL, immunoassays also react with a high molecular mass complex of PRL, macro-prolactin or big-big PRL, which has minimal bioactivity in vivo.

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