molecular weight


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Related to molecular weight: Low molecular weight heparin

weight

 [wāt]
1. heaviness; the degree to which a body is drawn toward the earth by gravity. (See also Tables of Weights and Measures in the Appendix.) Abbreviated wt.
2. in statistics, the process of assigning greater importance to some observations than to others, or a mathematical factor used to apply such a process.
apothecaries' weight see apothecaries' system.
atomic weight the sum of the masses of the constituents of an atom, expressed in atomic mass units (or daltons), in SI units (i.e., kilograms), or as a dimensionless ratio derived by comparing the mass to the mass of an atom of carbon-12, which is taken as 12.000. Abbreviated At wt.
avoirdupois weight see avoirdupois system.
equivalent weight the amount of substance that combines with or displaces 8.0 g of oxygen (or 1.008 g of hydrogen), usually expressed in grams; for acid/base reactions, one equivalent donates or receives a mole of protons and the equivalent weight is the ratio of the molecular weight to the number of protons involved in the reaction. For oxidation-reduction reactions, one equivalent donates or receives a mole of electrons and the equivalent weight is the ratio of the molecular weight to the number of electrons involved in the reaction.
gram molecular weight the molecular weight of a substance expressed in grams; one gram molecular weight of a molecular substance contains one mole of molecules. See also mole1.
low birth weight (LBW) see under infant.
molecular weight the weight of a molecule of a chemical compound as compared with the weight of an atom of carbon-12; it is equal to the sum of the weights of its constituent atoms and is dimensionless. Abbreviated Mol wt or MW. Although widely used, the term is not technically correct; relative molecular mass is preferable.
very low birth weight (VLBW) see under infant.

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.

mo·lec·u·lar weight

(mŏ-lekyū-lăr wāt)
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
Synonym(s): molecular weight ratio, relative molecular mass.

molecular weight

The sum of the weights of all the atoms in the molecule.

mo·lec·u·lar weight

(mol wt, MW) (mŏ-lekyū-lăr wāt)
The sum of the atomic weights of all the atoms constituting a molecule.
Synonym(s): molecular weight ratio, relative molecular mass.
References in periodicals archive ?
Our results suggested that buffalo and cow milk contain major allergens [beta]-lactoglobulin, [alpha]-lactoglobulin and caseins with molecular weight of 18.4KD, 14KDa and 30KDa respectively.
It was also found that the activation energy could be decreased by the existence of low molecular weight component.
This is despite the fact that we have known about the relationship between molecular weight and plastics performance for almost 100 years.
The molecular weight for the drug's protein backbone is 146,158, and the mean elimination half-life was 13 days.
After identifying the real source of the contamination such as wood pitch or stickies, a combined approach of next generation ultrahigh molecular weight organic fixatives and inorganic adsorbing agents such as bentonite or talc can find effective use to minimize costly machine downtime and off-quality paper or paperboard."
Repetition of this process results in a molecule of high molecular weight. Such a process is called addition polymerization.
According to new report available with Radiant Insights, the global Ultra-high Molecular Weight Polyethylene (UHMWPE) market report provides in-depth analysis of market by share, size, demand, economic trends, investment feasibility, major key players analysis and forecast.
Supercritical carbon dioxide can also plasticize and swell polymeric materials [14], Plasticization by scC[O.sub.2] leads to increased free volume and chain mobility [15], In addition, scC[O.sub.2] facilitates diffusion-controlled reactions [16, 17], Since acid surfactants are not used in production, polymers synthesized in scC[O.sub.2] have significantly fewer acid end groups leading to high molecular weight materials [18], In addition, following polymerization, PVDF may be isolated directly in the reactor from carbon dioxide resulting in little additional post-treatment of the PVDF product, eliminating the use organic solvents and decreasing the amount of waste water treatment.
Contract award: provision of pharmaceutical specialties: low molecular weight heparin - parenteral nutrition peripherally.
[ClickPress, Fri Feb 20 2015] Molecular Weight Marker Market by Products (DNA, RNA, Protein Ladders), Type (Prestained, Specialty), Application (PCR, Western Blotting, Gel Extraction), & End User (Academic Institutes, Pharmaceutical Companies, CRO) - Global Forecast to 2019
Buryak, Dix, and Kona developed a polyethylene with three components, a 15-50 wt% low molecular weight fraction of 15-40 kg/mole, a 15-50 wt% medium molecular weight fraction of 70-180 kg/mol, and a 15-40 wt% high molecular weight ethylene/hexene copolymer of 200-400 kg/mol.

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