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 molecular mass of the antifungal peptide was estimated by comparison of its electrophoretic mobility with those of molecular mass marker proteins from GE Healthcare including horse myoglobin peptides of different molecular mass: 16949,14404,10700,8159 and 6214 Da.
No free low molecular mass cTnI forms were detected in any of the patients at any time.
But it is possible only when the molecular mass of a chemical compound has a minus sign.
Binary blends with a constant PBT/PCL 80/20 wt/wt composition were prepared, using PCL samples of various molecular mass.
However, in addition to polymer structure it is also often used to calculate moments of the molecular mass distribution (see Appendix C).
It was eluted as a single homogeneous peak with the same elution volume as before corresponding to a molecular mass of 70 kDa (not shown).
High molecular mass forms of CA 19-9 have been reported in serum from patients with pancreatic tumors (9).
For example, in order to determine content of sodium (Na) in compounds with molecular mass NaOH (39.
r] was characterized by a viscosity-average molecular mass, about 200,000; TS, 83.
We used a series of molecular mass cut-off membranes (Centricon 10-100 kDa; Amicon, Beverly, MA, USA) and gel filtration (Sephadex G-150, 100, 50; Amersham Pharmacia Biotech, Baie d'Urfe, Quebec, Canada) to approximate the dynamic size and homogeneity of the VCP toxic constituent(s).
On masticating NBR containing low levels of acrylonitrile, most of the mechanical work is expended in breaking down high molecular mass fraction (ref.

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