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.
Farlex Partner Medical Dictionary © Farlex 2012


(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.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
In contrast to PU, it was found that the intrinsic viscosity [[eta]], and therefore the molecular mass of the neat PVC-sheet, do not change significantly after its mastication in the extruder even in the presence of destructing agents.
12 for about 10 repeat units (a range about 500 u wide) for lags out to nearly 3 repeat units starting each new window at 250 u increments with windows moving from 4877 u to the high molecular mass tail of the distribution.
3 when the atomic mass and the molecular mass are equal, i.e.
For the zones near the exposed surface, the whole MWD moved to the left (lower molecular masses) after 6 weeks UV exposure (Fig.
Next, while production of fragment ions in mass spectra was the bread-and-butter of the structural analyst, it obscured the desired molecular mass information in the spectrum.
Intrinsic viscosity (h) is a parameter of molecular mass that increased in polymers with increase the chain of carbon or any bulky groups.
Due to the same molecular mass, it was difficult to quantify the isomer carbonyl compounds in the mixture without the chromatographic separation.
All of the poly(isoprene)s have high molecular mass ([M.sub.w] higher than [10.sub.6] Da) and comparable molecular mass distribution ([M.sub.w]/[M.sub.n] equal to about 3).
Kenji Sato, examined plasma fractionated on the basis of molecular mass from human volunteers, where they discovered GSH in the protein-bound fraction of the plasma.
The molecular mass of the enzyme was found to be 30 kDa in SDS-polyacrylamide gel electrophoresis.
SDS-PAGE showed that these isolates secreted three or more proteins with proteolytic activity differing in molecular mass (Figures 5, 6).
They are defined as having a mass-average molecular weight of less than 8000 and for which at least 60% of the total weight has a molecular mass less than 8000.

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